Data: Everchanging and Eternally the Same - High-Performance Web Databases: Design, Development, and Deployment - page 571

Exhibit 39-2. Data and semantics.
for two reasons: (1) someone has to know where the “end of the wire” is;
and (2) someone has management responsibility for managing the frame at
the “end of the wire.”
Yet, technology has advanced. There are remote switches which allow
large businesses, governments and universities to maintain the same NXX
across what used to be NXX boundaries. With competition came Equal
Ease of Access rules, local number portability, and in some areas, overlay
— which means that two NPAs (area codes) can co-exist and overlap in the
same geographic area.
The most obvious data mismatch here will be a missing attribute — the
identity of the physical frame or frame location that represents the “end of
the wire.”
There are also more subtle impacts. Consider the situation where a plan-
ner depends on a query that measures working lines, and makes a predic-
tion when the next major investment will be required on communication
feeder routes. The planner enters the code number of the “Frame,” but the
calculations done by the query have a hidden anomaly that still assumes